Funny you mention this, I just ran brauflox as a SCH then sunken temple as a smn. I was able to easily heal through 4 stacks of poison and had to save my aetherflow for burst dps in sunken temple. We cleared both instances with ease.

I think it really comes down to the player, and correct me if I'm wrong, but the post is basically stating that we should know the weaknesses of our group because when you have a bad player on your team that weakness is amplified. Be the good player and cover that weakness and everyone should get along fine.